For the most part, Spanish is Spanish. Though different countries may have different ways of saying different things. In Spain it is common to use the "Vosotros" form of verbs to express "y'all"(You...
The language originated in España, therefore they called the language Español. Translated to english, that's Spain, and Spanish. They match by their root.Actually, the language spoken in most of...
Spain, Mexico, and basically all of South America. (except Brazil)Also the whole of Central America and some African countries like Guinea Ecuatorial (officially) and Morocco (non-officially)